Initial protected placeholders in xliff lost in Trados

If I open an xlf in Trados and if this xlf has protection tags around placeholders and this happens to be in an initial position, Trados just drops the placeholder altogether, which means I need to post-edit the xlf elsewhere to re-insert them.

I can't post the file but the header is

<?xml version="1.0" encoding="UTF-8"?>
<xliff xmlns:tilt="urn:logoport:xliffeditor:tilt-non-translatables:1.0" xmlns:xsi="www.w3.org/.../XMLSchema-instance" xmlns="urn:oasis:names:tc:xliff:document:1.2" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">

and a sample string is

<trans-unit xml:space="preserve" id="123456">
          <source><ph equiv-text="%1" tilt:type="do-not-translate" id="1">%1</ph> wants to send you notifications.</source>

which results in this:

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